[MacPorts] #64660: inkscape: build failure due to "no template named 'optional' in namespace 'std'"

[MacPorts]

#64660: inkscape: build failure due to "no template named 'optional' in namespace
'std'"
-------------------------------+----------------------
  Reporter:  dyne2meter        |      Owner:  mascguy
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.7.1
Resolution:                    |   Keywords:
      Port:  inkscape poppler  |
-------------------------------+----------------------

Comment (by mascguy):

 Replying to [comment:15 eric-j-ason]:
 > Is there a reason that we're using Inkscape 0.92 here, instead of a more
 recent version?

 That's simply because we haven't gotten around to updating it yet. Please
 see issue:61404.

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Ticket URL: <https://trac.macports.org/ticket/64660#comment:16>
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